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How does high humidity affect density altitude and airplane performance?

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  1. Raises density altitude and reduces performance
  2. Lowers density altitude and improves performance
  3. Has no effect on density altitude

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References

  1. FAA Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 4 www.faa.gov/regulations_policies/handbooks_manuals/aviation/faa-h-8083-25c.pdf Checked 2026-10-07.

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